consistently use momentum at POCA for PFDisplacedVertex momentum computations (same as #9703 from 74X)

[cmsbuild]

other than fixing a technical bug, it also allows to run (particleFlowDisplacedVertexCandidate+particleFlowDisplacedVertex) on AOD.

The difference in results is at numerical roundoff level (checked on ~1K events in ttbar with PU=35).

Automatically ported from CMSSW_7_5_X #9704 (original by @slava77).

[cmsbuild]

A new Pull Request was created by @cmsbuild for CMSSW_7_6_X.

consistently use momentum at POCA for PFDisplacedVertex momentum computations (same as #9703 from 74X)

It involves the following packages:

DataFormats/ParticleFlowReco

@cmsbuild, @cvuosalo, @slava77 can you please review it and eventually sign? Thanks.
@bachtis, @lgray this is something you requested to watch as well.
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[slava77]

+1

for #9766 e31c8c3

• this is the same code, the same topic branch as the 75X version consistently use momentum at POCA for PFDisplacedVertex momentum computations (same as #9703 from 74X) #9704

[slava77]

@cmsbuild please test
(for completeness)

[cmsbuild]

The tests are being triggered in jenkins.

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_6_X IBs or unless it breaks tests.

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_6_X IBs or unless it breaks tests.

[cmsbuild]

+1
Tested at: e31c8c3
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-9766/186479/summary.html

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_6_X IBs (tests are also fine). This pull request will be automatically merged.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-9766/186479/summary.html

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_6_X IBs (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @davidlange6, @Degano, @smuzaffar